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soft-fp: Define and use _FP_STATIC_ASSERT.
This patch makes soft-fp use static assertions in place of conditional calls to abort, in places where there are checks for conditions (on the types for which a macro is used) that the code is not prepared to handle. The fallback definition of _FP_STATIC_ASSERT (for kernel use only, as only relevant to compilers not supported for building glibc) is as in misc/sys/cdefs.h. This means that soft-fp only ever calls abort for _FP_UNREACHABLE calls in builds with GCC versions before 4.5. Thus, there is no need for an abort declaration or <stdlib.h> include, since the kernel code handles defining abort as a macro itself - and so this avoids any need for an __KERNEL__ condition on the abort declaration to avoid it breaking with the kernel's macro definition. That is, this patch is intended to make glibc's soft-fp code suitable for kernel use with no kernel-local changes to the soft-fp code needed at all. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by the patch. One explicit <stdlib.h> include had to be added to a file that was relying on the include from soft-fp.h. * soft-fp/soft-fp.h (_FP_STATIC_ASSERT): New macro. [_LIBC]: Do not include <stdlib.h>. [!_LIBC] (abort): Remove declaration. * soft-fp/op-2.h (_FP_MUL_MEAT_2_120_240_double): Use _FP_STATIC_ASSERT instead of conditionally calling abort. * soft-fp/op-common.h (_FP_FROM_INT): Likewise. (_FP_EXTEND_CNAN): Likewise. (FP_TRUNC): Likewise. (__FP_CLZ): Likewise. * sysdeps/powerpc/nofpu/flt-rounds.c: Include <stdlib.h>.
This commit is contained in:
Joseph Myers
parent
af85ebcdf7
commit
7d67a196b6
13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2015-03-12 Joseph Myers <joseph@codesourcery.com>
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* soft-fp/soft-fp.h (_FP_STATIC_ASSERT): New macro.
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[_LIBC]: Do not include <stdlib.h>.
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[!_LIBC] (abort): Remove declaration.
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* soft-fp/op-2.h (_FP_MUL_MEAT_2_120_240_double): Use
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_FP_STATIC_ASSERT instead of conditionally calling abort.
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* soft-fp/op-common.h (_FP_FROM_INT): Likewise.
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(_FP_EXTEND_CNAN): Likewise.
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(FP_TRUNC): Likewise.
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(__FP_CLZ): Likewise.
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* sysdeps/powerpc/nofpu/flt-rounds.c: Include <stdlib.h>.
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2015-03-12 Yaakov Selkowitz <yselkowi@redhat.com>
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* manual/string.texi (XPG basename): Fix prototype.
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@ -458,8 +458,8 @@
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_p240, _q240, _r240, _s240; \
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UDItype _t240, _u240, _v240, _w240, _x240, _y240 = 0; \
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\
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if ((wfracbits) < 106 || (wfracbits) > 120) \
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abort (); \
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_FP_STATIC_ASSERT ((wfracbits) >= 106 && (wfracbits) <= 120, \
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"wfracbits out of range"); \
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\
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setfetz; \
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\
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@ -1800,6 +1800,8 @@
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(r) = -(rtype) (r); \
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\
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_FP_FROM_INT_ur = (rtype) (r); \
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_FP_STATIC_ASSERT ((rsize) <= 2 * _FP_W_TYPE_SIZE, \
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"rsize too large"); \
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(void) (((rsize) <= _FP_W_TYPE_SIZE) \
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? ({ \
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int _FP_FROM_INT_lz; \
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@ -1808,17 +1810,15 @@
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X##_e = (_FP_EXPBIAS_##fs + _FP_W_TYPE_SIZE - 1 \
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- _FP_FROM_INT_lz); \
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}) \
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: (((rsize) <= 2 * _FP_W_TYPE_SIZE) \
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? ({ \
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int _FP_FROM_INT_lz; \
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__FP_CLZ_2 (_FP_FROM_INT_lz, \
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(_FP_W_TYPE) (_FP_FROM_INT_ur \
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>> _FP_W_TYPE_SIZE), \
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(_FP_W_TYPE) _FP_FROM_INT_ur); \
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X##_e = (_FP_EXPBIAS_##fs + 2 * _FP_W_TYPE_SIZE - 1 \
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- _FP_FROM_INT_lz); \
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}) \
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: ({ abort (); 0; }))); \
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: ({ \
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int _FP_FROM_INT_lz; \
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__FP_CLZ_2 (_FP_FROM_INT_lz, \
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(_FP_W_TYPE) (_FP_FROM_INT_ur \
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>> _FP_W_TYPE_SIZE), \
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(_FP_W_TYPE) _FP_FROM_INT_ur); \
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X##_e = (_FP_EXPBIAS_##fs + 2 * _FP_W_TYPE_SIZE - 1 \
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- _FP_FROM_INT_lz); \
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})); \
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\
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if ((rsize) - 1 + _FP_EXPBIAS_##fs >= _FP_EXPMAX_##fs \
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&& X##_e >= _FP_EXPMAX_##fs) \
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@ -1876,12 +1876,18 @@
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#define _FP_EXTEND_CNAN(dfs, sfs, dwc, swc, D, S, check_nan) \
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do \
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{ \
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if (_FP_FRACBITS_##dfs < _FP_FRACBITS_##sfs \
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|| (_FP_EXPMAX_##dfs - _FP_EXPBIAS_##dfs \
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< _FP_EXPMAX_##sfs - _FP_EXPBIAS_##sfs) \
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|| (_FP_EXPBIAS_##dfs < _FP_EXPBIAS_##sfs + _FP_FRACBITS_##sfs - 1 \
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&& _FP_EXPBIAS_##dfs != _FP_EXPBIAS_##sfs)) \
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abort (); \
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_FP_STATIC_ASSERT (_FP_FRACBITS_##dfs >= _FP_FRACBITS_##sfs, \
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"destination mantissa narrower than source"); \
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_FP_STATIC_ASSERT ((_FP_EXPMAX_##dfs - _FP_EXPBIAS_##dfs \
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>= _FP_EXPMAX_##sfs - _FP_EXPBIAS_##sfs), \
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"destination max exponent smaller" \
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" than source"); \
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_FP_STATIC_ASSERT (((_FP_EXPBIAS_##dfs \
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>= (_FP_EXPBIAS_##sfs \
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+ _FP_FRACBITS_##sfs - 1)) \
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|| (_FP_EXPBIAS_##dfs == _FP_EXPBIAS_##sfs)), \
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"source subnormals do not all become normal," \
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" but bias not the same"); \
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D##_s = S##_s; \
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_FP_FRAC_COPY_##dwc##_##swc (D, S); \
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if (_FP_EXP_NORMAL (sfs, swc, S)) \
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@ -1944,10 +1950,14 @@
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#define FP_TRUNC(dfs, sfs, dwc, swc, D, S) \
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do \
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{ \
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if (_FP_FRACBITS_##sfs < _FP_FRACBITS_##dfs \
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|| (_FP_EXPBIAS_##sfs < _FP_EXPBIAS_##dfs + _FP_FRACBITS_##dfs - 1 \
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&& _FP_EXPBIAS_##sfs != _FP_EXPBIAS_##dfs)) \
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abort (); \
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_FP_STATIC_ASSERT (_FP_FRACBITS_##sfs >= _FP_FRACBITS_##dfs, \
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"destination mantissa wider than source"); \
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_FP_STATIC_ASSERT (((_FP_EXPBIAS_##sfs \
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>= (_FP_EXPBIAS_##dfs \
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+ _FP_FRACBITS_##dfs - 1)) \
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|| _FP_EXPBIAS_##sfs == _FP_EXPBIAS_##dfs), \
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"source subnormals do not all become same," \
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" but bias not the same"); \
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D##_s = S##_s; \
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if (_FP_EXP_NORMAL (sfs, swc, S)) \
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{ \
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@ -2036,14 +2046,18 @@
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# define __FP_CLZ(r, x) \
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do \
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{ \
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_FP_STATIC_ASSERT ((sizeof (_FP_W_TYPE) == sizeof (unsigned int) \
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|| (sizeof (_FP_W_TYPE) \
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== sizeof (unsigned long)) \
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|| (sizeof (_FP_W_TYPE) \
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== sizeof (unsigned long long))), \
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"_FP_W_TYPE size unsupported for clz"); \
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if (sizeof (_FP_W_TYPE) == sizeof (unsigned int)) \
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(r) = __builtin_clz (x); \
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else if (sizeof (_FP_W_TYPE) == sizeof (unsigned long)) \
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(r) = __builtin_clzl (x); \
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else if (sizeof (_FP_W_TYPE) == sizeof (unsigned long long)) \
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else /* sizeof (_FP_W_TYPE) == sizeof (unsigned long long). */ \
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(r) = __builtin_clzll (x); \
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else \
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abort (); \
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} \
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while (0)
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#endif /* ndef __FP_CLZ */
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@ -60,6 +60,17 @@
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# define _FP_UNREACHABLE abort ()
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#endif
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#if ((defined __GNUC__ \
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&& (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))) \
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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
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# define _FP_STATIC_ASSERT(expr, msg) \
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_Static_assert ((expr), msg)
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#else
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# define _FP_STATIC_ASSERT(expr, msg) \
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extern int (*__Static_assert_function (void)) \
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[!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
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#endif
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/* In the Linux kernel, some architectures have a single function that
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uses different kinds of unpacking and packing depending on the
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instruction being emulated, meaning it is not readily visible to
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@ -340,10 +351,4 @@ typedef USItype UHWtype;
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# endif
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#endif
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#ifdef _LIBC
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# include <stdlib.h>
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#else
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extern void abort (void);
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#endif
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#endif /* !SOFT_FP_H */
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@ -16,6 +16,8 @@
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include "soft-fp.h"
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#include "soft-supp.h"
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